<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS</title>
    <style>
        /* div{
            color: red;
        } */
        /* a{
            color: green;
        } */
        /* .div1{
            color: gray;
        }
        #one{
            color: green;
        }
        *{
            /* 所有的 */
            /* color: brown;
        } */ 
        /* li{
            color: red;
        } */
        /* .c1{
            color: red;
        } */
        /* ul li{
            color: green;
        }
        ol li{
            color: red;
        }
        ol li a{
            color: purple;
        } */
        /* ol a{
            color: pink;
        } */
        /* .c1 a{
            color:green;
        } */
        /* a, span{
            color: red ;
            font-size: 40px;
        } */
         #one{
            border: black solid 10px ;

            /* border-color: black;
            border-width: 10px 5px 2px 1px;
            border-style: solid; */

            /* border-top-width: 10px;
            border-right-width: 5px;
            border-bottom-width: 2px;
            border-left-width: 1px; */
            height: 100px;
            width: 200px;
         }
         .div1{
            width: 200px;
            height: 100px;
            border: solid red 1px;
         }
    </style>
</head>
<body>
    <div class="div1" id="one">我是一个div111</div>
    <div>我是一个div222</div>
    <div><a href="#">我是一个div</a></div>
    <div class="div1"><span>我是一个div</span></div>
    <ul>
        <li>aaa</li>
        <li>bbb</li>
        <li>ccc</li>
    </ul>
    <ol>
        <li class="c1">ddd</li>
        <li class="c1">eee</li>
        <li class="c1"><a href="#">fff</a></li>
    </ol>
</body>
</html>